TGDimension.h

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// @(#)root/gui:$Id$
// Author: Fons Rademakers   02/01/98
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_TGDimension
#define ROOT_TGDimension
 
//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TGDimension, TGPosition, TGLongPosition, TGInsets and TGRectangle    //
//                                                                      //
// Several small geometry classes that implement dimensions             //
// (width and height), positions (x and y), insets and rectangles.      //
// They are trivial and their members are public.                       //
//                                                                      //
//////////////////////////////////////////////////////////////////////////
 
#include "TObject.h"
 
class TGDimension {
public:
   UInt_t  fWidth;       // width
   UInt_t  fHeight;      // height
 
   TGDimension(): fWidth(0), fHeight(0) { }
   TGDimension(UInt_t width, UInt_t height): fWidth(width), fHeight(height) { }
   ~TGDimension() = default;
 
   Bool_t operator==(const TGDimension &b) const
      { return ((fWidth == b.fWidth) && (fHeight == b.fHeight)); }
   TGDimension operator-(const TGDimension &b) const
      { return TGDimension(fWidth - b.fWidth, fHeight - b.fHeight); }
   TGDimension operator+(const TGDimension &b) const
      { return TGDimension(fWidth + b.fWidth, fHeight + b.fHeight); }
};
 
 
class TGPosition {
public:
   Int_t  fX;         // x position
   Int_t  fY;         // y position
 
   TGPosition(): fX(0), fY(0) { }
   TGPosition(Int_t xc, Int_t yc): fX(xc), fY(yc) { }
   ~TGPosition() = default;
 
   Bool_t operator==(const TGPosition &b) const
      { return ((fX == b.fX) && (fY == b.fY)); }
   TGPosition operator-(const TGPosition &b) const
      { return TGPosition(fX - b.fX, fY - b.fY); }
   TGPosition operator+(const TGPosition &b) const
      { return TGPosition(fX + b.fX, fY + b.fY); }
};
 
 
class TGLongPosition {
public:
   Long_t  fX;         // x position
   Long_t  fY;         // y position
 
   TGLongPosition(): fX(0), fY(0) { }
   TGLongPosition(Long_t xc, Long_t yc): fX(xc), fY(yc) { }
   ~TGLongPosition() = default;
 
   Bool_t operator==(const TGLongPosition &b) const
      { return ((fX == b.fX) && (fY == b.fY)); }
   TGLongPosition operator-(const TGLongPosition &b) const
      { return TGLongPosition(fX - b.fX, fY - b.fY); }
   TGLongPosition operator+(const TGLongPosition &b) const
      { return TGLongPosition(fX + b.fX, fY + b.fY); }
};
 
 
class TGInsets {
public:
   Int_t  fL;    // left
   Int_t  fR;    // right
   Int_t  fT;    // top
   Int_t  fB;    // bottom
 
   TGInsets(): fL(0), fR(0), fT(0), fB(0) { }
   TGInsets(Int_t lf, Int_t rg, Int_t tp, Int_t bt):
      fL(lf), fR(rg), fT(tp), fB(bt) { }
   ~TGInsets() = default;
 
   Bool_t operator==(const TGInsets &in) const
      { return ((fL == in.fL) && (fR == in.fR) && (fT == in.fT) && (fB == in.fB)); }
};
 
 
class TGRectangle {
public:
   Int_t         fX;    // x position
   Int_t         fY;    // y position
   UInt_t        fW;    // width
   UInt_t        fH;    // height
 
   // constructors
   TGRectangle(): fX(0), fY(0), fW(0), fH(0) { Empty(); }
   TGRectangle(Int_t rx, Int_t ry, UInt_t rw, UInt_t rh):
                fX(rx), fY(ry), fW(rw), fH(rh) { }
   TGRectangle(const TGPosition &p, const TGDimension &d):
                fX(p.fX), fY(p.fY), fW(d.fWidth), fH(d.fHeight) { }
   ~TGRectangle() = default;
 
   // methods
   Bool_t Contains(Int_t px, Int_t py) const
                { return ((px >= fX) && (px < fX + (Int_t) fW) &&
                          (py >= fY) && (py < fY + (Int_t) fH)); }
   Bool_t Contains(const TGPosition &p) const
                { return ((p.fX >= fX) && (p.fX < fX + (Int_t) fW) &&
                          (p.fY >= fY) && (p.fY < fY + (Int_t) fH)); }
   Bool_t Intersects(const TGRectangle &r) const
                { return ((fX <= r.fX + (Int_t) r.fW - 1) && (fX + (Int_t) fW - 1 >= r.fX) &&
                          (fY <= r.fY + (Int_t) r.fH - 1) && (fY + (Int_t) fH - 1 >= r.fY)); }
   Int_t Area() const
                { return (fW * fH); }
   TGDimension Size() const
                { return TGDimension(fW, fH); }
   TGPosition LeftTop() const
                { return TGPosition(fX, fY); }
   TGPosition RightBottom() const
                { return TGPosition(fX + (Int_t) fW - 1, fY + (Int_t) fH - 1); }
   void Merge(const TGRectangle &r);
   void Empty() { fX = fY = 0; fW = fH = 0; }
   Bool_t IsEmpty() const { return ((fW == 0) && (fH == 0)); }
};
 
#endif